saving a .v file triggers it to be opened in another window and gets E:325 in neovim

After trying to save a .v file, it triggers a new window to be opened with e:325 error with swap file already exists.

This only happens to .v files. This only happens when neovim is opened from that folder. This happened after trying to rename a .v file using Nerdtree plugin.

I tried deleting plugins, nvim-data and recopied neovim install files.